WO2008097994A2 - Éléments de filtration manufacturés - Google Patents

Éléments de filtration manufacturés Download PDF

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Publication number
WO2008097994A2
WO2008097994A2 PCT/US2008/053079 US2008053079W WO2008097994A2 WO 2008097994 A2 WO2008097994 A2 WO 2008097994A2 US 2008053079 W US2008053079 W US 2008053079W WO 2008097994 A2 WO2008097994 A2 WO 2008097994A2
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
etching
etched
filter
contoured
Prior art date
Application number
PCT/US2008/053079
Other languages
English (en)
Other versions
WO2008097994A3 (fr
Inventor
Kleo Kwok
Original Assignee
Invengineering Enterprises, Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Invengineering Enterprises, Llc filed Critical Invengineering Enterprises, Llc
Priority to EP08729071A priority Critical patent/EP2111274B1/fr
Priority to ES08729071T priority patent/ES2395163T3/es
Priority to CN2008800039729A priority patent/CN101600485B/zh
Publication of WO2008097994A2 publication Critical patent/WO2008097994A2/fr
Publication of WO2008097994A3 publication Critical patent/WO2008097994A3/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00—Filters for breathing-protection purposes
    • A62B23/02—Filters for breathing-protection purposes for respirators
    • A62B23/025—Filters for breathing-protection purposes for respirators the filter having substantially the shape of a mask
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/012—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/111—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/40—Particle separators, e.g. dust precipitators, using edge filters, i.e. using contiguous impervious surfaces

Definitions

  • This invention relates to the manufacture of filters.
  • the invention has particular utility with reference to the manufacture of reusable filter elements, and will be described in connection with such utility, although other utilities are contemplated.
  • the present invention provides improvement over such prior art methods.
  • the present invention employs photochemical etching techniques to manufacture a basic filtration element, which can then be used as a basis for constructing various devices for different applications.
  • sheets of etchable material are etched from one or both sides of that sheet to form channels in a premasked pattern, which controls the minimum opening of the filtration element.
  • the desired channel opening is only limited by the capability of the photochemical etching system being used.
  • the present invention provides a method for making a filter element by rolling or extruding a first sheet to form a plurality of recessed areas bordered by lands, selectively etching or punching through the recessed pattern areas, and bonding a second sheet having a plurality of etched or punched through areas to the first sheet, and, aligning the etched through areas to the second sheet with the recessed areas of the first sheet.
  • FIG. 1 grammatically illustrates an etching bath for forming a basic filtration element in accordance with the present invention
  • Figs. 2 and 3 illustrate etching patterns for a filtration element made in accordance with the present invention
  • Fig. 4, 4 A and 4B illustrate one embodiment of a filter made in accordance with the present invention
  • Fig. 5 illustrates how a filtration element made in accordance with the first embodiment of the present invention may be folded or pleated to increase the filtration area
  • Fig. 6 shows how a filtration element made in accordance with the present invention may be wrapped to form a cylindrical filter element
  • Fig. 7 shows how a basic filtering element of the present invention may be used to form a face mask
  • Fig. 8 is a block flow diagram illustrating the process of a second embodiment of the present invention
  • Fig. 9 is a side elevational view in cross section, illustrating the first step in the process of Fig. 8;
  • Fig. 10 is a side elevational view, in cross section, and Fig. 11 a top plan view, of an extruded sheet after etch through in a first etching step of the process of Fig. 8;
  • Fig. 12 is a side elevational view, in cross section, and Fig. 13 a top plan view, of a second sheet after etching in accordance with a second etching step of Fig. 8; and Fig. 14 is a side elevational view, in cross section, showing assembly of a plurality of sheets stacked to form a filter element in accordance with the second embodiment of the present invention.
  • a metal sheet 100 is immersed in an etching bath 102, and relative movement is established between the sheet and the bath, e.g. by moving the sheet back and forth in the bath, for example, with X being the direction of the sheet movement in the etching bath and Y being the thickness direction, the sheet of material is masked 104 and etched in the Y direction as depicted in Fig. 2.
  • the etch bath may be caused to flow over the sheet, or sprayed onto the sheet. The etch bath etches the sheet into etched patterned channels or openings 106,
  • etched channels 108 (Fig. 3) to a depth which in a preferred embodiment of the invention is just past half of the sheet thickness, as measured from both sides of the sheet.
  • the etched channels on one side are 106 offset from the etched channels 108 on other side so that when the sheet is etched from each side to a depth just past half the sheet thickness, the channels will meet with a predetermined width opening 110.
  • An exemplary pattern and the opening width is shown in Figs. 2 and 3.
  • the etched depth is controlled by the etchant flow, temperature, exposure time, etchant concentration, etc. This pattern is repeated in the X direction.
  • edge support 112 With proper edge support 112 (see Fig. 4), it can be used as a filter as shown in Figs. 4A and 4B, with fluid flows in the direction normal to the plate of this filter. Such an arrangement can be used as an air filter, or a household screen.
  • This rectangular geometry can be folded or pleated, e.g. as shown at 114 in Fig. 5 to increase the filtration area.
  • the filtration element also can be used as an environmental separator that allows gas, including air, to flow through but inhibits the passing of liquid, such as water due to capillary effects.
  • the filtration element also can be used as a filter for a FTVAC.
  • a FTVAC FTVAC.
  • heat will escape through the ceiling due to convective air flow, thus lowering the temperature of the living space.
  • dust particles that are larger than the largest opening of the filter from recirculating into the living space.
  • the basic sheet in another embodiment, shown in Fig. 6, can be cut into size, wrapped to form a cylinder, the two edges mated together, and one end of the cylinder capped at 1 16.
  • the resulting structure can then be used as a cartridge filter. Fluid can flow from the open end through the etched channel openings and out radially as shown in Fig.6. Particles larger in size than the maximum opening will be captured by the filtration element and retained inside the filter.
  • Applications include, but not limited to, oil, gas and chemical filtering.
  • this cylindrical shape can be folded to increase the filtration area and hence its efficiency and useful life.
  • the etched sheet can be formed into a face mask 118 by shaping the etched sheet into a semispherical or similar shape, as shown in Fig. 7.
  • the edge of this semispherical shape can be bonded with flexible material (such as rubber or plastic), and a stretchable strap 120 attached to two side edges.
  • flexible material such as rubber or plastic
  • Such a device can be used as a breathing apparatus by stretching the strap over the face of human or animal.
  • the flexible edge conforms to the fact of the human or animal and acts as a sealing boundary to prevent particles larger than the maximum opening of the filtration element getting to the breathed air stream.
  • the processed and formed filters can be manufactured to a high precision with openings only limited by the capability of the etching system employed.
  • the filtration element can be cleaned depending on the application and become reusable, thus reducing environmental wastes and concerns.
  • etch similar patterns on sides of the filter element for certain applications such as in a ceiling vent, it may be preferred to etch different size channels on the two sides.
  • various filter elements having different size channels may be stacked to form a filter that separates particles by size. Also, by controlling etching, it is possible to control the shape of the channels, e.g. so that they taper.
  • the present invention starts with a rolling or extrusion step 10 in which a first substrate, preferably a metal sheet 12 is extruded between a hard platen 14 and a roller 16.
  • the sheets making up the filter element may comprise rigid or flexible materials.
  • the filter material is formed from a rigid metal sheet.
  • Roller 16 has a plurality of lands 18 having a height or thickness T above valley areas 20. Lands 18 have a width W and are spaced from one another by a spacing S. Lands 18 may be formed by etching or machining away the surface of roller 16.
  • lands 18 and valley areas 20 may be formed by an additive process using, for example, plasma spraying and HVOF coating.
  • Roller 16 should be formed of a hard heat resistant material such as ceramic, hardened steel or titanium so as to permit extrusion of metal sheet 12 under high pressure and elevated temperature. Referring to Figs. 10 and 11, the extruded sheet is then subjected to an etching step
  • a second sheet 26 is subjected to a second etching step 28 to form a plurality of vias 30 preferably having similar length L and width B in a repeated pattern.
  • contoured etched sheet 12 resulting from step 22 and the etched sheet 28 resulting from step 28 are then stacked between top and bottom loading plates 30, 32, respectively, and the sheets 12 and 26 are bonded to one another at bonding surfaces 33 in a pressing or laminated step 34.
  • the pressing or laminating step 34 will be dependent on several factors including:
  • the valleys may be formed by a two step etching process wherein a series of valleys are formed in a first masked etching step, and then vias are formed through the valley regions in a second masked etching step.
  • the filter element may comprise a rigid or flexible material.
  • the filter material is formed from a rigid metal sheet.
  • the filter can be washed and reused. However, the filter does not have to be reused.
  • Forming the filter of metal also makes the filter useful, for example, in high temperature conditions such as in an engine exhaust or cooking exhaust.
  • the filter element, after etching may be coated with a catalyst material, e.g. for treating the exhaust.
  • the filters made in accordance with the present invention also may be used, for example, for automotive or other combustion applications.
  • the present invention provides manufacturing of filters to a high precision with openings only limited by the capability of the etching system employed. Also, forming the filtration elements of metal provides a filtration element that can be cleaned and reused.
  • the invention has been described as etching the elements from one side, it is possible to etch from both sides.
  • various filter elements having different size vias may be stacked to form a filter that separates particles by size.
  • by controlling etching it is possible to control the shape of the vias.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Filtering Materials (AREA)

Abstract

L'invention concerne des techniques de gravure sélective utilisées pour fabriquer un élément de filtration de base, qui peuvent ensuite être utilisées en tant que bases pour la construction de divers dispositifs pour différentes applications. Dans ce procédé, des feuilles de matériau pouvant être gravé sont gravées d'un côté ou des deux côtés de cette feuille pour former des canaux en un motif prémasqué, qui régule l'ouverture minimale de l'élément de filtration. L'ouverture du canal souhaitée est uniquement limitée par la capacité du système de gravure photochimique qui est utilisé. En variante, un élément de filtre peut être fabriqué en roulant ou en extrudant une première feuille pour former une pluralité de régions évidées entourées par des zones, en gravant sélectivement ou en perçant par poinçonnage à travers les régions de motif évidées, et en liant une seconde feuille comportant une pluralité de régions gravées ou percées par poinçonnage au travers de la première feuille, et en alignant les régions percées par poinçonnage au travers sur la seconde feuille avec les régions évidées de la première feuille.
PCT/US2008/053079 2007-02-08 2008-02-05 Éléments de filtration manufacturés WO2008097994A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP08729071A EP2111274B1 (fr) 2007-02-08 2008-02-05 Éléments de filtration manufacturés
ES08729071T ES2395163T3 (es) 2007-02-08 2008-02-05 Fabricación de elementos de filtración
CN2008800039729A CN101600485B (zh) 2007-02-08 2008-02-05 过滤元件的制造

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US88889507P 2007-02-08 2007-02-08
US60/888,895 2007-02-08
US98620607P 2007-11-07 2007-11-07
US60/986,206 2007-11-07
US12/024,697 US20080190887A1 (en) 2007-02-08 2008-02-01 Manufacture filtration elements
US12/024,697 2008-02-01

Publications (2)

Publication Number Publication Date
WO2008097994A2 true WO2008097994A2 (fr) 2008-08-14
WO2008097994A3 WO2008097994A3 (fr) 2008-11-06

Family

ID=39682382

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/053079 WO2008097994A2 (fr) 2007-02-08 2008-02-05 Éléments de filtration manufacturés

Country Status (5)

Country Link
US (1) US20080190887A1 (fr)
EP (2) EP2111274B1 (fr)
CN (1) CN101600485B (fr)
ES (1) ES2395163T3 (fr)
WO (1) WO2008097994A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2542356A1 (fr) * 2010-03-03 2013-01-09 Sandvik Intellectual Property Ab Nappe de tamisage
US10912364B2 (en) 2011-08-19 2021-02-09 Jemella Limited Hair dryer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106915097A (zh) * 2017-04-11 2017-07-04 新乡市万和过滤技术股份公司 一种滤材成形挤压装置
TWI648867B (zh) * 2018-01-16 2019-01-21 美屬薩摩亞商茂邦電子有限公司 Light guide plate with high aspect ratio light guide hole array and manufacturing method thereof
WO2019233708A1 (fr) * 2018-06-06 2019-12-12 Dräger Safety AG & Co. KGaA Masque de protection respiratoire et boîtier de filtre pour un masque de protection respiratoire
CN114953418B (zh) * 2022-04-29 2023-12-08 东莞领益精密制造科技有限公司 卷轴的成型工艺、卷轴屏的成型工艺及手机

Citations (1)

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Publication number Priority date Publication date Assignee Title
US5711877A (en) 1996-11-12 1998-01-27 Vacco Industries Etched disc with crosshatch pattern

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US3441145A (en) * 1966-12-01 1969-04-29 Ronald K Pearson Coil filter
US3648843A (en) * 1969-03-06 1972-03-14 Ronald K Pearson Stacked sheet filter assembly
US3900629A (en) * 1973-09-14 1975-08-19 Bendix Corp Porous laminate and method of manufacture
US5863312A (en) * 1992-10-23 1999-01-26 Wolfe; Michael Non-entraining filter
ES2282153T3 (es) * 1999-12-08 2007-10-16 Baxter International Inc. (A Delaware Corporation) Procedimiento para la fabricacion de una membrana filtrante microporosa.
AU2731701A (en) * 2000-01-07 2001-07-24 Dow Global Technologies Inc. Thermoformable ethylene/styrene interpolymer-based polymer blend film for three-dimensional transfer finish foil
US6414835B1 (en) * 2000-03-01 2002-07-02 Medtronic, Inc. Capacitive filtered feedthrough array for an implantable medical device
US6581640B1 (en) * 2000-08-16 2003-06-24 Kelsey-Hayes Company Laminated manifold for microvalve
US6589317B2 (en) * 2001-08-10 2003-07-08 3M Innovative Properties Company Structured surface filtration media array
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US20030150791A1 (en) * 2002-02-13 2003-08-14 Cho Steven T. Micro-fluidic anti-microbial filter
EP2075052A1 (fr) * 2002-07-25 2009-07-01 Dai Nippon Insatsu Kabushiki Kaisha Substrat de support à couche mince à utiliser dans un filtre de production d'hydrogène et procédé de production d'un filtre de production d'hydrogène
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Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US5711877A (en) 1996-11-12 1998-01-27 Vacco Industries Etched disc with crosshatch pattern

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2542356A1 (fr) * 2010-03-03 2013-01-09 Sandvik Intellectual Property Ab Nappe de tamisage
EP2542356A4 (fr) * 2010-03-03 2014-07-23 Sandvik Intellectual Property Nappe de tamisage
US10912364B2 (en) 2011-08-19 2021-02-09 Jemella Limited Hair dryer

Also Published As

Publication number Publication date
CN101600485A (zh) 2009-12-09
EP2551003B1 (fr) 2015-12-09
CN101600485B (zh) 2013-08-14
US20080190887A1 (en) 2008-08-14
ES2395163T3 (es) 2013-02-08
WO2008097994A3 (fr) 2008-11-06
EP2111274B1 (fr) 2012-10-24
EP2551003A1 (fr) 2013-01-30
EP2111274A2 (fr) 2009-10-28
EP2111274A4 (fr) 2010-09-15

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